Keystones — Lintel
Five GCSE retrieval questions · 29 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
37000000
Answer: 3.7 × 107 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 35
Answer: (x + 7)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 10cm, angle = 42°. Find opposite
Answer: 9cm -
4. Ratio Mixed ratio problems
In ratio 2:2:1, what fraction is the second part?
Answer: 2⁄5 -
5. Statistics Mean
The mean of 5 numbers is 25. If 4 of them are 15, 50, 50, 36, what is the missing number?
Answer: -26